ringhash: Remove TODO comment (#8096)

Author: arjan-bal

xds/internal/balancer/ringhash/ringhash.go

@@ -231,17 +231,6 @@ func (b *ringhashBalancer) updatePickerLocked() {
 		// TF. Since there must be at least one endpoint attempting to connect,
 		// we need to trigger one.
 		//
-		// TODO: https://github.com/grpc/grpc-go/issues/8085 - Restrict the
-		// condition under which an endpoint is connected. The pseudocode
-		// mentioned in A61 doesn't handle the following edge cases where the
-		// aggregated state is TF, but no endpoint actually enters TF:
-		// 1. There are four endpoints in the following states: TF, TF, READY,
-		//    and IDLE. If the READY endpoint fails, it transitions to IDLE,
-		//    resulting in the new states: TF, TF, IDLE, IDLE.
-		// 2. There are four endpoints in the following states: TF, TF,
-		//    CONNECTING, and IDLE. If the CONNECTING endpoint is removed, the
-		//    new states become: TF, TF, IDLE.
-
 		// After calling `ExitIdle` on a child balancer, the child will send a
 		// picker update asynchronously. A race condition may occur if another
 		// picker update from endpointsharding arrives before the child's